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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * TCP over IPv6 | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * | |
8 | * $Id: tcp_ipv6.c,v 1.144 2002/02/01 22:01:04 davem Exp $ | |
9 | * | |
10 | * Based on: | |
11 | * linux/net/ipv4/tcp.c | |
12 | * linux/net/ipv4/tcp_input.c | |
13 | * linux/net/ipv4/tcp_output.c | |
14 | * | |
15 | * Fixes: | |
16 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
17 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
18 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
19 | * a single port at the same time. | |
20 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. | |
21 | * | |
22 | * This program is free software; you can redistribute it and/or | |
23 | * modify it under the terms of the GNU General Public License | |
24 | * as published by the Free Software Foundation; either version | |
25 | * 2 of the License, or (at your option) any later version. | |
26 | */ | |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/config.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/socket.h> | |
33 | #include <linux/sockios.h> | |
34 | #include <linux/net.h> | |
35 | #include <linux/jiffies.h> | |
36 | #include <linux/in.h> | |
37 | #include <linux/in6.h> | |
38 | #include <linux/netdevice.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/jhash.h> | |
41 | #include <linux/ipsec.h> | |
42 | #include <linux/times.h> | |
43 | ||
44 | #include <linux/ipv6.h> | |
45 | #include <linux/icmpv6.h> | |
46 | #include <linux/random.h> | |
47 | ||
48 | #include <net/tcp.h> | |
49 | #include <net/ndisc.h> | |
5324a040 | 50 | #include <net/inet6_hashtables.h> |
8129765a | 51 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
52 | #include <net/ipv6.h> |
53 | #include <net/transp_v6.h> | |
54 | #include <net/addrconf.h> | |
55 | #include <net/ip6_route.h> | |
56 | #include <net/ip6_checksum.h> | |
57 | #include <net/inet_ecn.h> | |
58 | #include <net/protocol.h> | |
59 | #include <net/xfrm.h> | |
60 | #include <net/addrconf.h> | |
61 | #include <net/snmp.h> | |
62 | #include <net/dsfield.h> | |
6d6ee43e | 63 | #include <net/timewait_sock.h> |
1da177e4 LT |
64 | |
65 | #include <asm/uaccess.h> | |
66 | ||
67 | #include <linux/proc_fs.h> | |
68 | #include <linux/seq_file.h> | |
69 | ||
70 | static void tcp_v6_send_reset(struct sk_buff *skb); | |
60236fdd | 71 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
8292a17a | 72 | static void tcp_v6_send_check(struct sock *sk, int len, |
1da177e4 LT |
73 | struct sk_buff *skb); |
74 | ||
75 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 76 | |
8292a17a ACM |
77 | static struct inet_connection_sock_af_ops ipv6_mapped; |
78 | static struct inet_connection_sock_af_ops ipv6_specific; | |
1da177e4 | 79 | |
1da177e4 LT |
80 | static int tcp_v6_get_port(struct sock *sk, unsigned short snum) |
81 | { | |
971af18b ACM |
82 | return inet_csk_get_port(&tcp_hashinfo, sk, snum, |
83 | inet6_csk_bind_conflict); | |
1da177e4 LT |
84 | } |
85 | ||
1da177e4 LT |
86 | static void tcp_v6_hash(struct sock *sk) |
87 | { | |
88 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 89 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
90 | tcp_prot.hash(sk); |
91 | return; | |
92 | } | |
93 | local_bh_disable(); | |
90b19d31 | 94 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
95 | local_bh_enable(); |
96 | } | |
97 | } | |
98 | ||
1da177e4 LT |
99 | static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len, |
100 | struct in6_addr *saddr, | |
101 | struct in6_addr *daddr, | |
102 | unsigned long base) | |
103 | { | |
104 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
105 | } | |
106 | ||
107 | static __u32 tcp_v6_init_sequence(struct sock *sk, struct sk_buff *skb) | |
108 | { | |
109 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
110 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, | |
111 | skb->nh.ipv6h->saddr.s6_addr32, | |
112 | skb->h.th->dest, | |
113 | skb->h.th->source); | |
114 | } else { | |
115 | return secure_tcp_sequence_number(skb->nh.iph->daddr, | |
116 | skb->nh.iph->saddr, | |
117 | skb->h.th->dest, | |
118 | skb->h.th->source); | |
119 | } | |
120 | } | |
121 | ||
505cbfc5 | 122 | static int __tcp_v6_check_established(struct sock *sk, const __u16 lport, |
8feaf0c0 | 123 | struct inet_timewait_sock **twp) |
1da177e4 LT |
124 | { |
125 | struct inet_sock *inet = inet_sk(sk); | |
505cbfc5 ACM |
126 | const struct ipv6_pinfo *np = inet6_sk(sk); |
127 | const struct in6_addr *daddr = &np->rcv_saddr; | |
128 | const struct in6_addr *saddr = &np->daddr; | |
129 | const int dif = sk->sk_bound_dev_if; | |
8feaf0c0 | 130 | const u32 ports = INET_COMBINED_PORTS(inet->dport, lport); |
81c3d547 ED |
131 | unsigned int hash = inet6_ehashfn(daddr, inet->num, saddr, inet->dport); |
132 | struct inet_ehash_bucket *head = inet_ehash_bucket(&tcp_hashinfo, hash); | |
1da177e4 | 133 | struct sock *sk2; |
8feaf0c0 ACM |
134 | const struct hlist_node *node; |
135 | struct inet_timewait_sock *tw; | |
1da177e4 | 136 | |
81c3d547 | 137 | prefetch(head->chain.first); |
1da177e4 LT |
138 | write_lock(&head->lock); |
139 | ||
140 | /* Check TIME-WAIT sockets first. */ | |
6e04e021 | 141 | sk_for_each(sk2, node, &(head + tcp_hashinfo.ehash_size)->chain) { |
0fa1a53e | 142 | const struct inet6_timewait_sock *tw6 = inet6_twsk(sk2); |
8feaf0c0 ACM |
143 | |
144 | tw = inet_twsk(sk2); | |
1da177e4 LT |
145 | |
146 | if(*((__u32 *)&(tw->tw_dport)) == ports && | |
147 | sk2->sk_family == PF_INET6 && | |
0fa1a53e ACM |
148 | ipv6_addr_equal(&tw6->tw_v6_daddr, saddr) && |
149 | ipv6_addr_equal(&tw6->tw_v6_rcv_saddr, daddr) && | |
1da177e4 | 150 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) { |
6d6ee43e | 151 | if (twsk_unique(sk, sk2, twp)) |
1da177e4 | 152 | goto unique; |
6d6ee43e | 153 | else |
1da177e4 LT |
154 | goto not_unique; |
155 | } | |
156 | } | |
157 | tw = NULL; | |
158 | ||
159 | /* And established part... */ | |
160 | sk_for_each(sk2, node, &head->chain) { | |
81c3d547 | 161 | if (INET6_MATCH(sk2, hash, saddr, daddr, ports, dif)) |
1da177e4 LT |
162 | goto not_unique; |
163 | } | |
164 | ||
165 | unique: | |
166 | BUG_TRAP(sk_unhashed(sk)); | |
167 | __sk_add_node(sk, &head->chain); | |
81c3d547 | 168 | sk->sk_hash = hash; |
1da177e4 LT |
169 | sock_prot_inc_use(sk->sk_prot); |
170 | write_unlock(&head->lock); | |
171 | ||
172 | if (twp) { | |
173 | *twp = tw; | |
174 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
175 | } else if (tw) { | |
176 | /* Silly. Should hash-dance instead... */ | |
295ff7ed | 177 | inet_twsk_deschedule(tw, &tcp_death_row); |
1da177e4 LT |
178 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); |
179 | ||
8feaf0c0 | 180 | inet_twsk_put(tw); |
1da177e4 LT |
181 | } |
182 | return 0; | |
183 | ||
184 | not_unique: | |
185 | write_unlock(&head->lock); | |
186 | return -EADDRNOTAVAIL; | |
187 | } | |
188 | ||
189 | static inline u32 tcpv6_port_offset(const struct sock *sk) | |
190 | { | |
191 | const struct inet_sock *inet = inet_sk(sk); | |
192 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
193 | ||
194 | return secure_tcpv6_port_ephemeral(np->rcv_saddr.s6_addr32, | |
195 | np->daddr.s6_addr32, | |
196 | inet->dport); | |
197 | } | |
198 | ||
199 | static int tcp_v6_hash_connect(struct sock *sk) | |
200 | { | |
201 | unsigned short snum = inet_sk(sk)->num; | |
0f7ff927 ACM |
202 | struct inet_bind_hashbucket *head; |
203 | struct inet_bind_bucket *tb; | |
1da177e4 LT |
204 | int ret; |
205 | ||
206 | if (!snum) { | |
207 | int low = sysctl_local_port_range[0]; | |
208 | int high = sysctl_local_port_range[1]; | |
209 | int range = high - low; | |
210 | int i; | |
211 | int port; | |
212 | static u32 hint; | |
213 | u32 offset = hint + tcpv6_port_offset(sk); | |
214 | struct hlist_node *node; | |
8feaf0c0 | 215 | struct inet_timewait_sock *tw = NULL; |
1da177e4 LT |
216 | |
217 | local_bh_disable(); | |
218 | for (i = 1; i <= range; i++) { | |
219 | port = low + (i + offset) % range; | |
6e04e021 | 220 | head = &tcp_hashinfo.bhash[inet_bhashfn(port, tcp_hashinfo.bhash_size)]; |
1da177e4 LT |
221 | spin_lock(&head->lock); |
222 | ||
223 | /* Does not bother with rcv_saddr checks, | |
224 | * because the established check is already | |
225 | * unique enough. | |
226 | */ | |
0f7ff927 | 227 | inet_bind_bucket_for_each(tb, node, &head->chain) { |
1da177e4 LT |
228 | if (tb->port == port) { |
229 | BUG_TRAP(!hlist_empty(&tb->owners)); | |
230 | if (tb->fastreuse >= 0) | |
231 | goto next_port; | |
232 | if (!__tcp_v6_check_established(sk, | |
233 | port, | |
234 | &tw)) | |
235 | goto ok; | |
236 | goto next_port; | |
237 | } | |
238 | } | |
239 | ||
6e04e021 | 240 | tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, head, port); |
1da177e4 LT |
241 | if (!tb) { |
242 | spin_unlock(&head->lock); | |
243 | break; | |
244 | } | |
245 | tb->fastreuse = -1; | |
246 | goto ok; | |
247 | ||
248 | next_port: | |
249 | spin_unlock(&head->lock); | |
250 | } | |
251 | local_bh_enable(); | |
252 | ||
253 | return -EADDRNOTAVAIL; | |
254 | ||
255 | ok: | |
256 | hint += i; | |
257 | ||
258 | /* Head lock still held and bh's disabled */ | |
2d8c4ce5 | 259 | inet_bind_hash(sk, tb, port); |
1da177e4 LT |
260 | if (sk_unhashed(sk)) { |
261 | inet_sk(sk)->sport = htons(port); | |
90b19d31 | 262 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
263 | } |
264 | spin_unlock(&head->lock); | |
265 | ||
266 | if (tw) { | |
295ff7ed | 267 | inet_twsk_deschedule(tw, &tcp_death_row); |
8feaf0c0 | 268 | inet_twsk_put(tw); |
1da177e4 LT |
269 | } |
270 | ||
271 | ret = 0; | |
272 | goto out; | |
273 | } | |
274 | ||
6e04e021 | 275 | head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_hashinfo.bhash_size)]; |
463c84b9 | 276 | tb = inet_csk(sk)->icsk_bind_hash; |
1da177e4 LT |
277 | spin_lock_bh(&head->lock); |
278 | ||
279 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
90b19d31 | 280 | __inet6_hash(&tcp_hashinfo, sk); |
1da177e4 LT |
281 | spin_unlock_bh(&head->lock); |
282 | return 0; | |
283 | } else { | |
284 | spin_unlock(&head->lock); | |
285 | /* No definite answer... Walk to established hash table */ | |
286 | ret = __tcp_v6_check_established(sk, snum, NULL); | |
287 | out: | |
288 | local_bh_enable(); | |
289 | return ret; | |
290 | } | |
291 | } | |
292 | ||
1da177e4 LT |
293 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
294 | int addr_len) | |
295 | { | |
296 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
297 | struct inet_sock *inet = inet_sk(sk); | |
298 | struct ipv6_pinfo *np = inet6_sk(sk); | |
299 | struct tcp_sock *tp = tcp_sk(sk); | |
300 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
301 | struct flowi fl; | |
302 | struct dst_entry *dst; | |
303 | int addr_type; | |
304 | int err; | |
305 | ||
306 | if (addr_len < SIN6_LEN_RFC2133) | |
307 | return -EINVAL; | |
308 | ||
309 | if (usin->sin6_family != AF_INET6) | |
310 | return(-EAFNOSUPPORT); | |
311 | ||
312 | memset(&fl, 0, sizeof(fl)); | |
313 | ||
314 | if (np->sndflow) { | |
315 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; | |
316 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
317 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
318 | struct ip6_flowlabel *flowlabel; | |
319 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
320 | if (flowlabel == NULL) | |
321 | return -EINVAL; | |
322 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
323 | fl6_sock_release(flowlabel); | |
324 | } | |
325 | } | |
326 | ||
327 | /* | |
328 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
329 | */ | |
330 | ||
331 | if(ipv6_addr_any(&usin->sin6_addr)) | |
332 | usin->sin6_addr.s6_addr[15] = 0x1; | |
333 | ||
334 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
335 | ||
336 | if(addr_type & IPV6_ADDR_MULTICAST) | |
337 | return -ENETUNREACH; | |
338 | ||
339 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
340 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
341 | usin->sin6_scope_id) { | |
342 | /* If interface is set while binding, indices | |
343 | * must coincide. | |
344 | */ | |
345 | if (sk->sk_bound_dev_if && | |
346 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
347 | return -EINVAL; | |
348 | ||
349 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
350 | } | |
351 | ||
352 | /* Connect to link-local address requires an interface */ | |
353 | if (!sk->sk_bound_dev_if) | |
354 | return -EINVAL; | |
355 | } | |
356 | ||
357 | if (tp->rx_opt.ts_recent_stamp && | |
358 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
359 | tp->rx_opt.ts_recent = 0; | |
360 | tp->rx_opt.ts_recent_stamp = 0; | |
361 | tp->write_seq = 0; | |
362 | } | |
363 | ||
364 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
365 | np->flow_label = fl.fl6_flowlabel; | |
366 | ||
367 | /* | |
368 | * TCP over IPv4 | |
369 | */ | |
370 | ||
371 | if (addr_type == IPV6_ADDR_MAPPED) { | |
372 | u32 exthdrlen = tp->ext_header_len; | |
373 | struct sockaddr_in sin; | |
374 | ||
375 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
376 | ||
377 | if (__ipv6_only_sock(sk)) | |
378 | return -ENETUNREACH; | |
379 | ||
380 | sin.sin_family = AF_INET; | |
381 | sin.sin_port = usin->sin6_port; | |
382 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
383 | ||
8292a17a | 384 | inet_csk(sk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 LT |
385 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
386 | ||
387 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
388 | ||
389 | if (err) { | |
390 | tp->ext_header_len = exthdrlen; | |
8292a17a | 391 | inet_csk(sk)->icsk_af_ops = &ipv6_specific; |
1da177e4 LT |
392 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
393 | goto failure; | |
394 | } else { | |
395 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
396 | inet->saddr); | |
397 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
398 | inet->rcv_saddr); | |
399 | } | |
400 | ||
401 | return err; | |
402 | } | |
403 | ||
404 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
405 | saddr = &np->rcv_saddr; | |
406 | ||
407 | fl.proto = IPPROTO_TCP; | |
408 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
409 | ipv6_addr_copy(&fl.fl6_src, | |
410 | (saddr ? saddr : &np->saddr)); | |
411 | fl.oif = sk->sk_bound_dev_if; | |
412 | fl.fl_ip_dport = usin->sin6_port; | |
413 | fl.fl_ip_sport = inet->sport; | |
414 | ||
415 | if (np->opt && np->opt->srcrt) { | |
416 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
417 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
418 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
419 | final_p = &final; | |
420 | } | |
421 | ||
422 | err = ip6_dst_lookup(sk, &dst, &fl); | |
423 | if (err) | |
424 | goto failure; | |
425 | if (final_p) | |
426 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
427 | ||
e104411b | 428 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
1da177e4 | 429 | goto failure; |
1da177e4 LT |
430 | |
431 | if (saddr == NULL) { | |
432 | saddr = &fl.fl6_src; | |
433 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
434 | } | |
435 | ||
436 | /* set the source address */ | |
437 | ipv6_addr_copy(&np->saddr, saddr); | |
438 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
439 | ||
440 | ip6_dst_store(sk, dst, NULL); | |
441 | sk->sk_route_caps = dst->dev->features & | |
442 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
443 | ||
444 | tp->ext_header_len = 0; | |
445 | if (np->opt) | |
446 | tp->ext_header_len = np->opt->opt_flen + np->opt->opt_nflen; | |
447 | ||
448 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
449 | ||
450 | inet->dport = usin->sin6_port; | |
451 | ||
452 | tcp_set_state(sk, TCP_SYN_SENT); | |
453 | err = tcp_v6_hash_connect(sk); | |
454 | if (err) | |
455 | goto late_failure; | |
456 | ||
457 | if (!tp->write_seq) | |
458 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
459 | np->daddr.s6_addr32, | |
460 | inet->sport, | |
461 | inet->dport); | |
462 | ||
463 | err = tcp_connect(sk); | |
464 | if (err) | |
465 | goto late_failure; | |
466 | ||
467 | return 0; | |
468 | ||
469 | late_failure: | |
470 | tcp_set_state(sk, TCP_CLOSE); | |
471 | __sk_dst_reset(sk); | |
472 | failure: | |
473 | inet->dport = 0; | |
474 | sk->sk_route_caps = 0; | |
475 | return err; | |
476 | } | |
477 | ||
478 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
479 | int type, int code, int offset, __u32 info) | |
480 | { | |
481 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
505cbfc5 | 482 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
483 | struct ipv6_pinfo *np; |
484 | struct sock *sk; | |
485 | int err; | |
486 | struct tcp_sock *tp; | |
487 | __u32 seq; | |
488 | ||
505cbfc5 ACM |
489 | sk = inet6_lookup(&tcp_hashinfo, &hdr->daddr, th->dest, &hdr->saddr, |
490 | th->source, skb->dev->ifindex); | |
1da177e4 LT |
491 | |
492 | if (sk == NULL) { | |
493 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
494 | return; | |
495 | } | |
496 | ||
497 | if (sk->sk_state == TCP_TIME_WAIT) { | |
8feaf0c0 | 498 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
499 | return; |
500 | } | |
501 | ||
502 | bh_lock_sock(sk); | |
503 | if (sock_owned_by_user(sk)) | |
504 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
505 | ||
506 | if (sk->sk_state == TCP_CLOSE) | |
507 | goto out; | |
508 | ||
509 | tp = tcp_sk(sk); | |
510 | seq = ntohl(th->seq); | |
511 | if (sk->sk_state != TCP_LISTEN && | |
512 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
513 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
514 | goto out; | |
515 | } | |
516 | ||
517 | np = inet6_sk(sk); | |
518 | ||
519 | if (type == ICMPV6_PKT_TOOBIG) { | |
520 | struct dst_entry *dst = NULL; | |
521 | ||
522 | if (sock_owned_by_user(sk)) | |
523 | goto out; | |
524 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
525 | goto out; | |
526 | ||
527 | /* icmp should have updated the destination cache entry */ | |
528 | dst = __sk_dst_check(sk, np->dst_cookie); | |
529 | ||
530 | if (dst == NULL) { | |
531 | struct inet_sock *inet = inet_sk(sk); | |
532 | struct flowi fl; | |
533 | ||
534 | /* BUGGG_FUTURE: Again, it is not clear how | |
535 | to handle rthdr case. Ignore this complexity | |
536 | for now. | |
537 | */ | |
538 | memset(&fl, 0, sizeof(fl)); | |
539 | fl.proto = IPPROTO_TCP; | |
540 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
541 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
542 | fl.oif = sk->sk_bound_dev_if; | |
543 | fl.fl_ip_dport = inet->dport; | |
544 | fl.fl_ip_sport = inet->sport; | |
545 | ||
546 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
547 | sk->sk_err_soft = -err; | |
548 | goto out; | |
549 | } | |
550 | ||
551 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
552 | sk->sk_err_soft = -err; | |
553 | goto out; | |
554 | } | |
555 | ||
556 | } else | |
557 | dst_hold(dst); | |
558 | ||
559 | if (tp->pmtu_cookie > dst_mtu(dst)) { | |
560 | tcp_sync_mss(sk, dst_mtu(dst)); | |
561 | tcp_simple_retransmit(sk); | |
562 | } /* else let the usual retransmit timer handle it */ | |
563 | dst_release(dst); | |
564 | goto out; | |
565 | } | |
566 | ||
567 | icmpv6_err_convert(type, code, &err); | |
568 | ||
60236fdd | 569 | /* Might be for an request_sock */ |
1da177e4 | 570 | switch (sk->sk_state) { |
60236fdd | 571 | struct request_sock *req, **prev; |
1da177e4 LT |
572 | case TCP_LISTEN: |
573 | if (sock_owned_by_user(sk)) | |
574 | goto out; | |
575 | ||
8129765a ACM |
576 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
577 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
578 | if (!req) |
579 | goto out; | |
580 | ||
581 | /* ICMPs are not backlogged, hence we cannot get | |
582 | * an established socket here. | |
583 | */ | |
584 | BUG_TRAP(req->sk == NULL); | |
585 | ||
2e6599cb | 586 | if (seq != tcp_rsk(req)->snt_isn) { |
1da177e4 LT |
587 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
588 | goto out; | |
589 | } | |
590 | ||
463c84b9 | 591 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
592 | goto out; |
593 | ||
594 | case TCP_SYN_SENT: | |
595 | case TCP_SYN_RECV: /* Cannot happen. | |
596 | It can, it SYNs are crossed. --ANK */ | |
597 | if (!sock_owned_by_user(sk)) { | |
598 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
599 | sk->sk_err = err; | |
600 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
601 | ||
602 | tcp_done(sk); | |
603 | } else | |
604 | sk->sk_err_soft = err; | |
605 | goto out; | |
606 | } | |
607 | ||
608 | if (!sock_owned_by_user(sk) && np->recverr) { | |
609 | sk->sk_err = err; | |
610 | sk->sk_error_report(sk); | |
611 | } else | |
612 | sk->sk_err_soft = err; | |
613 | ||
614 | out: | |
615 | bh_unlock_sock(sk); | |
616 | sock_put(sk); | |
617 | } | |
618 | ||
619 | ||
60236fdd | 620 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
1da177e4 LT |
621 | struct dst_entry *dst) |
622 | { | |
ca304b61 | 623 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
624 | struct ipv6_pinfo *np = inet6_sk(sk); |
625 | struct sk_buff * skb; | |
626 | struct ipv6_txoptions *opt = NULL; | |
627 | struct in6_addr * final_p = NULL, final; | |
628 | struct flowi fl; | |
629 | int err = -1; | |
630 | ||
631 | memset(&fl, 0, sizeof(fl)); | |
632 | fl.proto = IPPROTO_TCP; | |
2e6599cb ACM |
633 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
634 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); | |
1da177e4 | 635 | fl.fl6_flowlabel = 0; |
2e6599cb ACM |
636 | fl.oif = treq->iif; |
637 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1da177e4 LT |
638 | fl.fl_ip_sport = inet_sk(sk)->sport; |
639 | ||
640 | if (dst == NULL) { | |
641 | opt = np->opt; | |
642 | if (opt == NULL && | |
333fad53 | 643 | np->rxopt.bits.osrcrt == 2 && |
2e6599cb ACM |
644 | treq->pktopts) { |
645 | struct sk_buff *pktopts = treq->pktopts; | |
1da177e4 LT |
646 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); |
647 | if (rxopt->srcrt) | |
648 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt)); | |
649 | } | |
650 | ||
651 | if (opt && opt->srcrt) { | |
652 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
653 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
654 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
655 | final_p = &final; | |
656 | } | |
657 | ||
658 | err = ip6_dst_lookup(sk, &dst, &fl); | |
659 | if (err) | |
660 | goto done; | |
661 | if (final_p) | |
662 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
663 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
664 | goto done; | |
665 | } | |
666 | ||
667 | skb = tcp_make_synack(sk, dst, req); | |
668 | if (skb) { | |
669 | struct tcphdr *th = skb->h.th; | |
670 | ||
671 | th->check = tcp_v6_check(th, skb->len, | |
2e6599cb | 672 | &treq->loc_addr, &treq->rmt_addr, |
1da177e4 LT |
673 | csum_partial((char *)th, skb->len, skb->csum)); |
674 | ||
2e6599cb | 675 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
676 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
677 | if (err == NET_XMIT_CN) | |
678 | err = 0; | |
679 | } | |
680 | ||
681 | done: | |
1da177e4 LT |
682 | if (opt && opt != np->opt) |
683 | sock_kfree_s(sk, opt, opt->tot_len); | |
684 | return err; | |
685 | } | |
686 | ||
60236fdd | 687 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 688 | { |
ca304b61 ACM |
689 | if (inet6_rsk(req)->pktopts) |
690 | kfree_skb(inet6_rsk(req)->pktopts); | |
1da177e4 LT |
691 | } |
692 | ||
60236fdd | 693 | static struct request_sock_ops tcp6_request_sock_ops = { |
1da177e4 | 694 | .family = AF_INET6, |
2e6599cb | 695 | .obj_size = sizeof(struct tcp6_request_sock), |
1da177e4 | 696 | .rtx_syn_ack = tcp_v6_send_synack, |
60236fdd ACM |
697 | .send_ack = tcp_v6_reqsk_send_ack, |
698 | .destructor = tcp_v6_reqsk_destructor, | |
1da177e4 LT |
699 | .send_reset = tcp_v6_send_reset |
700 | }; | |
701 | ||
6d6ee43e ACM |
702 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
703 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
704 | .twsk_unique = tcp_twsk_unique, | |
705 | }; | |
706 | ||
8292a17a | 707 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
1da177e4 LT |
708 | { |
709 | struct ipv6_pinfo *np = inet6_sk(sk); | |
8292a17a | 710 | struct tcphdr *th = skb->h.th; |
1da177e4 LT |
711 | |
712 | if (skb->ip_summed == CHECKSUM_HW) { | |
713 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); | |
714 | skb->csum = offsetof(struct tcphdr, check); | |
715 | } else { | |
716 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, | |
717 | csum_partial((char *)th, th->doff<<2, | |
718 | skb->csum)); | |
719 | } | |
720 | } | |
721 | ||
722 | ||
723 | static void tcp_v6_send_reset(struct sk_buff *skb) | |
724 | { | |
725 | struct tcphdr *th = skb->h.th, *t1; | |
726 | struct sk_buff *buff; | |
727 | struct flowi fl; | |
728 | ||
729 | if (th->rst) | |
730 | return; | |
731 | ||
732 | if (!ipv6_unicast_destination(skb)) | |
733 | return; | |
734 | ||
735 | /* | |
736 | * We need to grab some memory, and put together an RST, | |
737 | * and then put it into the queue to be sent. | |
738 | */ | |
739 | ||
740 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr), | |
741 | GFP_ATOMIC); | |
742 | if (buff == NULL) | |
743 | return; | |
744 | ||
745 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr)); | |
746 | ||
747 | t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr)); | |
748 | ||
749 | /* Swap the send and the receive. */ | |
750 | memset(t1, 0, sizeof(*t1)); | |
751 | t1->dest = th->source; | |
752 | t1->source = th->dest; | |
753 | t1->doff = sizeof(*t1)/4; | |
754 | t1->rst = 1; | |
755 | ||
756 | if(th->ack) { | |
757 | t1->seq = th->ack_seq; | |
758 | } else { | |
759 | t1->ack = 1; | |
760 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin | |
761 | + skb->len - (th->doff<<2)); | |
762 | } | |
763 | ||
764 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); | |
765 | ||
766 | memset(&fl, 0, sizeof(fl)); | |
767 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
768 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
769 | ||
770 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
771 | sizeof(*t1), IPPROTO_TCP, | |
772 | buff->csum); | |
773 | ||
774 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 775 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
776 | fl.fl_ip_dport = t1->dest; |
777 | fl.fl_ip_sport = t1->source; | |
778 | ||
779 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
780 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
781 | ||
ecc51b6d ACM |
782 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
783 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
784 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
785 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); | |
1da177e4 | 786 | return; |
ecc51b6d | 787 | } |
1da177e4 LT |
788 | } |
789 | ||
790 | kfree_skb(buff); | |
791 | } | |
792 | ||
793 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) | |
794 | { | |
795 | struct tcphdr *th = skb->h.th, *t1; | |
796 | struct sk_buff *buff; | |
797 | struct flowi fl; | |
798 | int tot_len = sizeof(struct tcphdr); | |
799 | ||
800 | if (ts) | |
801 | tot_len += 3*4; | |
802 | ||
803 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, | |
804 | GFP_ATOMIC); | |
805 | if (buff == NULL) | |
806 | return; | |
807 | ||
808 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); | |
809 | ||
810 | t1 = (struct tcphdr *) skb_push(buff,tot_len); | |
811 | ||
812 | /* Swap the send and the receive. */ | |
813 | memset(t1, 0, sizeof(*t1)); | |
814 | t1->dest = th->source; | |
815 | t1->source = th->dest; | |
816 | t1->doff = tot_len/4; | |
817 | t1->seq = htonl(seq); | |
818 | t1->ack_seq = htonl(ack); | |
819 | t1->ack = 1; | |
820 | t1->window = htons(win); | |
821 | ||
822 | if (ts) { | |
823 | u32 *ptr = (u32*)(t1 + 1); | |
824 | *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
825 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
826 | *ptr++ = htonl(tcp_time_stamp); | |
827 | *ptr = htonl(ts); | |
828 | } | |
829 | ||
830 | buff->csum = csum_partial((char *)t1, tot_len, 0); | |
831 | ||
832 | memset(&fl, 0, sizeof(fl)); | |
833 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); | |
834 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); | |
835 | ||
836 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
837 | tot_len, IPPROTO_TCP, | |
838 | buff->csum); | |
839 | ||
840 | fl.proto = IPPROTO_TCP; | |
505cbfc5 | 841 | fl.oif = inet6_iif(skb); |
1da177e4 LT |
842 | fl.fl_ip_dport = t1->dest; |
843 | fl.fl_ip_sport = t1->source; | |
844 | ||
845 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { | |
ecc51b6d ACM |
846 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
847 | ip6_xmit(NULL, buff, &fl, NULL, 0); | |
848 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); | |
1da177e4 | 849 | return; |
ecc51b6d | 850 | } |
1da177e4 LT |
851 | } |
852 | ||
853 | kfree_skb(buff); | |
854 | } | |
855 | ||
856 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
857 | { | |
8feaf0c0 ACM |
858 | struct inet_timewait_sock *tw = inet_twsk(sk); |
859 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk); | |
1da177e4 | 860 | |
8feaf0c0 ACM |
861 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
862 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, | |
863 | tcptw->tw_ts_recent); | |
1da177e4 | 864 | |
8feaf0c0 | 865 | inet_twsk_put(tw); |
1da177e4 LT |
866 | } |
867 | ||
60236fdd | 868 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
1da177e4 | 869 | { |
2e6599cb | 870 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent); |
1da177e4 LT |
871 | } |
872 | ||
873 | ||
874 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
875 | { | |
60236fdd | 876 | struct request_sock *req, **prev; |
505cbfc5 | 877 | const struct tcphdr *th = skb->h.th; |
1da177e4 LT |
878 | struct sock *nsk; |
879 | ||
880 | /* Find possible connection requests. */ | |
8129765a ACM |
881 | req = inet6_csk_search_req(sk, &prev, th->source, |
882 | &skb->nh.ipv6h->saddr, | |
883 | &skb->nh.ipv6h->daddr, inet6_iif(skb)); | |
1da177e4 LT |
884 | if (req) |
885 | return tcp_check_req(sk, skb, req, prev); | |
886 | ||
505cbfc5 ACM |
887 | nsk = __inet6_lookup_established(&tcp_hashinfo, &skb->nh.ipv6h->saddr, |
888 | th->source, &skb->nh.ipv6h->daddr, | |
889 | ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
890 | |
891 | if (nsk) { | |
892 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
893 | bh_lock_sock(nsk); | |
894 | return nsk; | |
895 | } | |
8feaf0c0 | 896 | inet_twsk_put((struct inet_timewait_sock *)nsk); |
1da177e4 LT |
897 | return NULL; |
898 | } | |
899 | ||
900 | #if 0 /*def CONFIG_SYN_COOKIES*/ | |
901 | if (!th->rst && !th->syn && th->ack) | |
902 | sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt)); | |
903 | #endif | |
904 | return sk; | |
905 | } | |
906 | ||
1da177e4 LT |
907 | /* FIXME: this is substantially similar to the ipv4 code. |
908 | * Can some kind of merge be done? -- erics | |
909 | */ | |
910 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
911 | { | |
ca304b61 | 912 | struct inet6_request_sock *treq; |
1da177e4 LT |
913 | struct ipv6_pinfo *np = inet6_sk(sk); |
914 | struct tcp_options_received tmp_opt; | |
915 | struct tcp_sock *tp = tcp_sk(sk); | |
60236fdd | 916 | struct request_sock *req = NULL; |
1da177e4 LT |
917 | __u32 isn = TCP_SKB_CB(skb)->when; |
918 | ||
919 | if (skb->protocol == htons(ETH_P_IP)) | |
920 | return tcp_v4_conn_request(sk, skb); | |
921 | ||
922 | if (!ipv6_unicast_destination(skb)) | |
923 | goto drop; | |
924 | ||
925 | /* | |
926 | * There are no SYN attacks on IPv6, yet... | |
927 | */ | |
463c84b9 | 928 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
1da177e4 LT |
929 | if (net_ratelimit()) |
930 | printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n"); | |
931 | goto drop; | |
932 | } | |
933 | ||
463c84b9 | 934 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
935 | goto drop; |
936 | ||
ca304b61 | 937 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
938 | if (req == NULL) |
939 | goto drop; | |
940 | ||
941 | tcp_clear_options(&tmp_opt); | |
942 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
943 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
944 | ||
945 | tcp_parse_options(skb, &tmp_opt, 0); | |
946 | ||
947 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; | |
948 | tcp_openreq_init(req, &tmp_opt, skb); | |
949 | ||
ca304b61 | 950 | treq = inet6_rsk(req); |
2e6599cb ACM |
951 | ipv6_addr_copy(&treq->rmt_addr, &skb->nh.ipv6h->saddr); |
952 | ipv6_addr_copy(&treq->loc_addr, &skb->nh.ipv6h->daddr); | |
1da177e4 | 953 | TCP_ECN_create_request(req, skb->h.th); |
2e6599cb | 954 | treq->pktopts = NULL; |
1da177e4 | 955 | if (ipv6_opt_accepted(sk, skb) || |
333fad53 YH |
956 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
957 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1da177e4 | 958 | atomic_inc(&skb->users); |
2e6599cb | 959 | treq->pktopts = skb; |
1da177e4 | 960 | } |
2e6599cb | 961 | treq->iif = sk->sk_bound_dev_if; |
1da177e4 LT |
962 | |
963 | /* So that link locals have meaning */ | |
964 | if (!sk->sk_bound_dev_if && | |
2e6599cb | 965 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
505cbfc5 | 966 | treq->iif = inet6_iif(skb); |
1da177e4 LT |
967 | |
968 | if (isn == 0) | |
969 | isn = tcp_v6_init_sequence(sk,skb); | |
970 | ||
2e6599cb | 971 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 LT |
972 | |
973 | if (tcp_v6_send_synack(sk, req, NULL)) | |
974 | goto drop; | |
975 | ||
8129765a | 976 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1da177e4 LT |
977 | return 0; |
978 | ||
979 | drop: | |
980 | if (req) | |
60236fdd | 981 | reqsk_free(req); |
1da177e4 LT |
982 | |
983 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); | |
984 | return 0; /* don't send reset */ | |
985 | } | |
986 | ||
987 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 988 | struct request_sock *req, |
1da177e4 LT |
989 | struct dst_entry *dst) |
990 | { | |
ca304b61 | 991 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
992 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
993 | struct tcp6_sock *newtcp6sk; | |
994 | struct inet_sock *newinet; | |
995 | struct tcp_sock *newtp; | |
996 | struct sock *newsk; | |
997 | struct ipv6_txoptions *opt; | |
998 | ||
999 | if (skb->protocol == htons(ETH_P_IP)) { | |
1000 | /* | |
1001 | * v6 mapped | |
1002 | */ | |
1003 | ||
1004 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1005 | ||
1006 | if (newsk == NULL) | |
1007 | return NULL; | |
1008 | ||
1009 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1010 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1011 | ||
1012 | newinet = inet_sk(newsk); | |
1013 | newnp = inet6_sk(newsk); | |
1014 | newtp = tcp_sk(newsk); | |
1015 | ||
1016 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1017 | ||
1018 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
1019 | newinet->daddr); | |
1020 | ||
1021 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
1022 | newinet->saddr); | |
1023 | ||
1024 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1025 | ||
8292a17a | 1026 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 LT |
1027 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
1028 | newnp->pktoptions = NULL; | |
1029 | newnp->opt = NULL; | |
505cbfc5 | 1030 | newnp->mcast_oif = inet6_iif(skb); |
1da177e4 LT |
1031 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
1032 | ||
e6848976 ACM |
1033 | /* |
1034 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1035 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1036 | * that function for the gory details. -acme | |
1da177e4 | 1037 | */ |
1da177e4 LT |
1038 | |
1039 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1040 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1041 | Sync it now. |
1042 | */ | |
1043 | tcp_sync_mss(newsk, newtp->pmtu_cookie); | |
1044 | ||
1045 | return newsk; | |
1046 | } | |
1047 | ||
1048 | opt = np->opt; | |
1049 | ||
1050 | if (sk_acceptq_is_full(sk)) | |
1051 | goto out_overflow; | |
1052 | ||
333fad53 | 1053 | if (np->rxopt.bits.osrcrt == 2 && |
2e6599cb ACM |
1054 | opt == NULL && treq->pktopts) { |
1055 | struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts); | |
1da177e4 | 1056 | if (rxopt->srcrt) |
2e6599cb | 1057 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr *)(treq->pktopts->nh.raw + rxopt->srcrt)); |
1da177e4 LT |
1058 | } |
1059 | ||
1060 | if (dst == NULL) { | |
1061 | struct in6_addr *final_p = NULL, final; | |
1062 | struct flowi fl; | |
1063 | ||
1064 | memset(&fl, 0, sizeof(fl)); | |
1065 | fl.proto = IPPROTO_TCP; | |
2e6599cb | 1066 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
1da177e4 LT |
1067 | if (opt && opt->srcrt) { |
1068 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1069 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1070 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1071 | final_p = &final; | |
1072 | } | |
2e6599cb | 1073 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
1da177e4 | 1074 | fl.oif = sk->sk_bound_dev_if; |
2e6599cb | 1075 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
1da177e4 LT |
1076 | fl.fl_ip_sport = inet_sk(sk)->sport; |
1077 | ||
1078 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1079 | goto out; | |
1080 | ||
1081 | if (final_p) | |
1082 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1083 | ||
1084 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1085 | goto out; | |
1086 | } | |
1087 | ||
1088 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1089 | if (newsk == NULL) | |
1090 | goto out; | |
1091 | ||
e6848976 ACM |
1092 | /* |
1093 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1094 | * count here, tcp_create_openreq_child now does this for us, see the | |
1095 | * comment in that function for the gory details. -acme | |
1096 | */ | |
1da177e4 LT |
1097 | |
1098 | ip6_dst_store(newsk, dst, NULL); | |
1099 | newsk->sk_route_caps = dst->dev->features & | |
1100 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1101 | ||
1102 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1103 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1104 | ||
1105 | newtp = tcp_sk(newsk); | |
1106 | newinet = inet_sk(newsk); | |
1107 | newnp = inet6_sk(newsk); | |
1108 | ||
1109 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1110 | ||
2e6599cb ACM |
1111 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1112 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1113 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1114 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 LT |
1115 | |
1116 | /* Now IPv6 options... | |
1117 | ||
1118 | First: no IPv4 options. | |
1119 | */ | |
1120 | newinet->opt = NULL; | |
1121 | ||
1122 | /* Clone RX bits */ | |
1123 | newnp->rxopt.all = np->rxopt.all; | |
1124 | ||
1125 | /* Clone pktoptions received with SYN */ | |
1126 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1127 | if (treq->pktopts != NULL) { |
1128 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1129 | kfree_skb(treq->pktopts); | |
1130 | treq->pktopts = NULL; | |
1da177e4 LT |
1131 | if (newnp->pktoptions) |
1132 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1133 | } | |
1134 | newnp->opt = NULL; | |
505cbfc5 | 1135 | newnp->mcast_oif = inet6_iif(skb); |
1da177e4 LT |
1136 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
1137 | ||
1138 | /* Clone native IPv6 options from listening socket (if any) | |
1139 | ||
1140 | Yes, keeping reference count would be much more clever, | |
1141 | but we make one more one thing there: reattach optmem | |
1142 | to newsk. | |
1143 | */ | |
1144 | if (opt) { | |
1145 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1146 | if (opt != np->opt) | |
1147 | sock_kfree_s(sk, opt, opt->tot_len); | |
1148 | } | |
1149 | ||
1150 | newtp->ext_header_len = 0; | |
1151 | if (newnp->opt) | |
1152 | newtp->ext_header_len = newnp->opt->opt_nflen + | |
1153 | newnp->opt->opt_flen; | |
1154 | ||
1155 | tcp_sync_mss(newsk, dst_mtu(dst)); | |
1156 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); | |
1157 | tcp_initialize_rcv_mss(newsk); | |
1158 | ||
1159 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1160 | ||
90b19d31 | 1161 | __inet6_hash(&tcp_hashinfo, newsk); |
2d8c4ce5 | 1162 | inet_inherit_port(&tcp_hashinfo, sk, newsk); |
1da177e4 LT |
1163 | |
1164 | return newsk; | |
1165 | ||
1166 | out_overflow: | |
1167 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1168 | out: | |
1169 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1170 | if (opt && opt != np->opt) | |
1171 | sock_kfree_s(sk, opt, opt->tot_len); | |
1172 | dst_release(dst); | |
1173 | return NULL; | |
1174 | } | |
1175 | ||
1176 | static int tcp_v6_checksum_init(struct sk_buff *skb) | |
1177 | { | |
1178 | if (skb->ip_summed == CHECKSUM_HW) { | |
1da177e4 | 1179 | if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, |
fb286bb2 HX |
1180 | &skb->nh.ipv6h->daddr,skb->csum)) { |
1181 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1da177e4 | 1182 | return 0; |
fb286bb2 | 1183 | } |
1da177e4 | 1184 | } |
fb286bb2 HX |
1185 | |
1186 | skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, | |
1187 | &skb->nh.ipv6h->daddr, 0); | |
1188 | ||
1da177e4 | 1189 | if (skb->len <= 76) { |
fb286bb2 | 1190 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1191 | } |
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | /* The socket must have it's spinlock held when we get | |
1196 | * here. | |
1197 | * | |
1198 | * We have a potential double-lock case here, so even when | |
1199 | * doing backlog processing we use the BH locking scheme. | |
1200 | * This is because we cannot sleep with the original spinlock | |
1201 | * held. | |
1202 | */ | |
1203 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1204 | { | |
1205 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1206 | struct tcp_sock *tp; | |
1207 | struct sk_buff *opt_skb = NULL; | |
1208 | ||
1209 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1210 | goes to IPv4 receive handler and backlogged. | |
1211 | From backlog it always goes here. Kerboom... | |
1212 | Fortunately, tcp_rcv_established and rcv_established | |
1213 | handle them correctly, but it is not case with | |
1214 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1215 | */ | |
1216 | ||
1217 | if (skb->protocol == htons(ETH_P_IP)) | |
1218 | return tcp_v4_do_rcv(sk, skb); | |
1219 | ||
1220 | if (sk_filter(sk, skb, 0)) | |
1221 | goto discard; | |
1222 | ||
1223 | /* | |
1224 | * socket locking is here for SMP purposes as backlog rcv | |
1225 | * is currently called with bh processing disabled. | |
1226 | */ | |
1227 | ||
1228 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1229 | ||
1230 | Yes, guys, it is the only place in our code, where we | |
1231 | may make it not affecting IPv4. | |
1232 | The rest of code is protocol independent, | |
1233 | and I do not like idea to uglify IPv4. | |
1234 | ||
1235 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1236 | looks not very well thought. For now we latch | |
1237 | options, received in the last packet, enqueued | |
1238 | by tcp. Feel free to propose better solution. | |
1239 | --ANK (980728) | |
1240 | */ | |
1241 | if (np->rxopt.all) | |
1242 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1243 | ||
1244 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
1245 | TCP_CHECK_TIMER(sk); | |
1246 | if (tcp_rcv_established(sk, skb, skb->h.th, skb->len)) | |
1247 | goto reset; | |
1248 | TCP_CHECK_TIMER(sk); | |
1249 | if (opt_skb) | |
1250 | goto ipv6_pktoptions; | |
1251 | return 0; | |
1252 | } | |
1253 | ||
1254 | if (skb->len < (skb->h.th->doff<<2) || tcp_checksum_complete(skb)) | |
1255 | goto csum_err; | |
1256 | ||
1257 | if (sk->sk_state == TCP_LISTEN) { | |
1258 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); | |
1259 | if (!nsk) | |
1260 | goto discard; | |
1261 | ||
1262 | /* | |
1263 | * Queue it on the new socket if the new socket is active, | |
1264 | * otherwise we just shortcircuit this and continue with | |
1265 | * the new socket.. | |
1266 | */ | |
1267 | if(nsk != sk) { | |
1268 | if (tcp_child_process(sk, nsk, skb)) | |
1269 | goto reset; | |
1270 | if (opt_skb) | |
1271 | __kfree_skb(opt_skb); | |
1272 | return 0; | |
1273 | } | |
1274 | } | |
1275 | ||
1276 | TCP_CHECK_TIMER(sk); | |
1277 | if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len)) | |
1278 | goto reset; | |
1279 | TCP_CHECK_TIMER(sk); | |
1280 | if (opt_skb) | |
1281 | goto ipv6_pktoptions; | |
1282 | return 0; | |
1283 | ||
1284 | reset: | |
1285 | tcp_v6_send_reset(skb); | |
1286 | discard: | |
1287 | if (opt_skb) | |
1288 | __kfree_skb(opt_skb); | |
1289 | kfree_skb(skb); | |
1290 | return 0; | |
1291 | csum_err: | |
1292 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1293 | goto discard; | |
1294 | ||
1295 | ||
1296 | ipv6_pktoptions: | |
1297 | /* Do you ask, what is it? | |
1298 | ||
1299 | 1. skb was enqueued by tcp. | |
1300 | 2. skb is added to tail of read queue, rather than out of order. | |
1301 | 3. socket is not in passive state. | |
1302 | 4. Finally, it really contains options, which user wants to receive. | |
1303 | */ | |
1304 | tp = tcp_sk(sk); | |
1305 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1306 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1307 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1308 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1309 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
1da177e4 LT |
1310 | np->mcast_hops = opt_skb->nh.ipv6h->hop_limit; |
1311 | if (ipv6_opt_accepted(sk, opt_skb)) { | |
1312 | skb_set_owner_r(opt_skb, sk); | |
1313 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1314 | } else { | |
1315 | __kfree_skb(opt_skb); | |
1316 | opt_skb = xchg(&np->pktoptions, NULL); | |
1317 | } | |
1318 | } | |
1319 | ||
1320 | if (opt_skb) | |
1321 | kfree_skb(opt_skb); | |
1322 | return 0; | |
1323 | } | |
1324 | ||
1325 | static int tcp_v6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) | |
1326 | { | |
1327 | struct sk_buff *skb = *pskb; | |
1328 | struct tcphdr *th; | |
1329 | struct sock *sk; | |
1330 | int ret; | |
1331 | ||
1332 | if (skb->pkt_type != PACKET_HOST) | |
1333 | goto discard_it; | |
1334 | ||
1335 | /* | |
1336 | * Count it even if it's bad. | |
1337 | */ | |
1338 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); | |
1339 | ||
1340 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1341 | goto discard_it; | |
1342 | ||
1343 | th = skb->h.th; | |
1344 | ||
1345 | if (th->doff < sizeof(struct tcphdr)/4) | |
1346 | goto bad_packet; | |
1347 | if (!pskb_may_pull(skb, th->doff*4)) | |
1348 | goto discard_it; | |
1349 | ||
1350 | if ((skb->ip_summed != CHECKSUM_UNNECESSARY && | |
fb286bb2 | 1351 | tcp_v6_checksum_init(skb))) |
1da177e4 LT |
1352 | goto bad_packet; |
1353 | ||
1354 | th = skb->h.th; | |
1355 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1356 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1357 | skb->len - th->doff*4); | |
1358 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1359 | TCP_SKB_CB(skb)->when = 0; | |
1360 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(skb->nh.ipv6h); | |
1361 | TCP_SKB_CB(skb)->sacked = 0; | |
1362 | ||
505cbfc5 ACM |
1363 | sk = __inet6_lookup(&tcp_hashinfo, &skb->nh.ipv6h->saddr, th->source, |
1364 | &skb->nh.ipv6h->daddr, ntohs(th->dest), | |
1365 | inet6_iif(skb)); | |
1da177e4 LT |
1366 | |
1367 | if (!sk) | |
1368 | goto no_tcp_socket; | |
1369 | ||
1370 | process: | |
1371 | if (sk->sk_state == TCP_TIME_WAIT) | |
1372 | goto do_time_wait; | |
1373 | ||
1374 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1375 | goto discard_and_relse; | |
1376 | ||
1377 | if (sk_filter(sk, skb, 0)) | |
1378 | goto discard_and_relse; | |
1379 | ||
1380 | skb->dev = NULL; | |
1381 | ||
1382 | bh_lock_sock(sk); | |
1383 | ret = 0; | |
1384 | if (!sock_owned_by_user(sk)) { | |
1385 | if (!tcp_prequeue(sk, skb)) | |
1386 | ret = tcp_v6_do_rcv(sk, skb); | |
1387 | } else | |
1388 | sk_add_backlog(sk, skb); | |
1389 | bh_unlock_sock(sk); | |
1390 | ||
1391 | sock_put(sk); | |
1392 | return ret ? -1 : 0; | |
1393 | ||
1394 | no_tcp_socket: | |
1395 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1396 | goto discard_it; | |
1397 | ||
1398 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1399 | bad_packet: | |
1400 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
1401 | } else { | |
1402 | tcp_v6_send_reset(skb); | |
1403 | } | |
1404 | ||
1405 | discard_it: | |
1406 | ||
1407 | /* | |
1408 | * Discard frame | |
1409 | */ | |
1410 | ||
1411 | kfree_skb(skb); | |
1412 | return 0; | |
1413 | ||
1414 | discard_and_relse: | |
1415 | sock_put(sk); | |
1416 | goto discard_it; | |
1417 | ||
1418 | do_time_wait: | |
1419 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
8feaf0c0 | 1420 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
1421 | goto discard_it; |
1422 | } | |
1423 | ||
1424 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1425 | TCP_INC_STATS_BH(TCP_MIB_INERRS); | |
8feaf0c0 | 1426 | inet_twsk_put((struct inet_timewait_sock *)sk); |
1da177e4 LT |
1427 | goto discard_it; |
1428 | } | |
1429 | ||
8feaf0c0 ACM |
1430 | switch (tcp_timewait_state_process((struct inet_timewait_sock *)sk, |
1431 | skb, th)) { | |
1da177e4 LT |
1432 | case TCP_TW_SYN: |
1433 | { | |
1434 | struct sock *sk2; | |
1435 | ||
505cbfc5 ACM |
1436 | sk2 = inet6_lookup_listener(&tcp_hashinfo, |
1437 | &skb->nh.ipv6h->daddr, | |
1438 | ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 | 1439 | if (sk2 != NULL) { |
295ff7ed ACM |
1440 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1441 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1442 | inet_twsk_put(tw); | |
1da177e4 LT |
1443 | sk = sk2; |
1444 | goto process; | |
1445 | } | |
1446 | /* Fall through to ACK */ | |
1447 | } | |
1448 | case TCP_TW_ACK: | |
1449 | tcp_v6_timewait_ack(sk, skb); | |
1450 | break; | |
1451 | case TCP_TW_RST: | |
1452 | goto no_tcp_socket; | |
1453 | case TCP_TW_SUCCESS:; | |
1454 | } | |
1455 | goto discard_it; | |
1456 | } | |
1457 | ||
1da177e4 LT |
1458 | static int tcp_v6_remember_stamp(struct sock *sk) |
1459 | { | |
1460 | /* Alas, not yet... */ | |
1461 | return 0; | |
1462 | } | |
1463 | ||
8292a17a | 1464 | static struct inet_connection_sock_af_ops ipv6_specific = { |
b9750ce1 | 1465 | .queue_xmit = inet6_csk_xmit, |
1da177e4 | 1466 | .send_check = tcp_v6_send_check, |
b9750ce1 | 1467 | .rebuild_header = inet6_sk_rebuild_header, |
1da177e4 LT |
1468 | .conn_request = tcp_v6_conn_request, |
1469 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1470 | .remember_stamp = tcp_v6_remember_stamp, | |
1471 | .net_header_len = sizeof(struct ipv6hdr), | |
1472 | ||
1473 | .setsockopt = ipv6_setsockopt, | |
1474 | .getsockopt = ipv6_getsockopt, | |
b9750ce1 | 1475 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
1da177e4 LT |
1476 | .sockaddr_len = sizeof(struct sockaddr_in6) |
1477 | }; | |
1478 | ||
1479 | /* | |
1480 | * TCP over IPv4 via INET6 API | |
1481 | */ | |
1482 | ||
8292a17a | 1483 | static struct inet_connection_sock_af_ops ipv6_mapped = { |
1da177e4 LT |
1484 | .queue_xmit = ip_queue_xmit, |
1485 | .send_check = tcp_v4_send_check, | |
32519f11 | 1486 | .rebuild_header = inet_sk_rebuild_header, |
1da177e4 LT |
1487 | .conn_request = tcp_v6_conn_request, |
1488 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
1489 | .remember_stamp = tcp_v4_remember_stamp, | |
1490 | .net_header_len = sizeof(struct iphdr), | |
1491 | ||
1492 | .setsockopt = ipv6_setsockopt, | |
1493 | .getsockopt = ipv6_getsockopt, | |
b9750ce1 | 1494 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
1da177e4 LT |
1495 | .sockaddr_len = sizeof(struct sockaddr_in6) |
1496 | }; | |
1497 | ||
1498 | ||
1499 | ||
1500 | /* NOTE: A lot of things set to zero explicitly by call to | |
1501 | * sk_alloc() so need not be done here. | |
1502 | */ | |
1503 | static int tcp_v6_init_sock(struct sock *sk) | |
1504 | { | |
6687e988 | 1505 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1506 | struct tcp_sock *tp = tcp_sk(sk); |
1507 | ||
1508 | skb_queue_head_init(&tp->out_of_order_queue); | |
1509 | tcp_init_xmit_timers(sk); | |
1510 | tcp_prequeue_init(tp); | |
1511 | ||
6687e988 | 1512 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1513 | tp->mdev = TCP_TIMEOUT_INIT; |
1514 | ||
1515 | /* So many TCP implementations out there (incorrectly) count the | |
1516 | * initial SYN frame in their delayed-ACK and congestion control | |
1517 | * algorithms that we must have the following bandaid to talk | |
1518 | * efficiently to them. -DaveM | |
1519 | */ | |
1520 | tp->snd_cwnd = 2; | |
1521 | ||
1522 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1523 | * initialization of these values. | |
1524 | */ | |
1525 | tp->snd_ssthresh = 0x7fffffff; | |
1526 | tp->snd_cwnd_clamp = ~0; | |
c1b4a7e6 | 1527 | tp->mss_cache = 536; |
1da177e4 LT |
1528 | |
1529 | tp->reordering = sysctl_tcp_reordering; | |
1530 | ||
1531 | sk->sk_state = TCP_CLOSE; | |
1532 | ||
8292a17a | 1533 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1534 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
1da177e4 LT |
1535 | sk->sk_write_space = sk_stream_write_space; |
1536 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1537 | ||
1538 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; | |
1539 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1540 | ||
1541 | atomic_inc(&tcp_sockets_allocated); | |
1542 | ||
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | static int tcp_v6_destroy_sock(struct sock *sk) | |
1547 | { | |
1da177e4 LT |
1548 | tcp_v4_destroy_sock(sk); |
1549 | return inet6_destroy_sock(sk); | |
1550 | } | |
1551 | ||
1552 | /* Proc filesystem TCPv6 sock list dumping. */ | |
1553 | static void get_openreq6(struct seq_file *seq, | |
60236fdd | 1554 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1555 | { |
1da177e4 | 1556 | int ttd = req->expires - jiffies; |
ca304b61 ACM |
1557 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1558 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1559 | |
1560 | if (ttd < 0) | |
1561 | ttd = 0; | |
1562 | ||
1da177e4 LT |
1563 | seq_printf(seq, |
1564 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1565 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1566 | i, | |
1567 | src->s6_addr32[0], src->s6_addr32[1], | |
1568 | src->s6_addr32[2], src->s6_addr32[3], | |
1569 | ntohs(inet_sk(sk)->sport), | |
1570 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1571 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1572 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1573 | TCP_SYN_RECV, |
1574 | 0,0, /* could print option size, but that is af dependent. */ | |
1575 | 1, /* timers active (only the expire timer) */ | |
1576 | jiffies_to_clock_t(ttd), | |
1577 | req->retrans, | |
1578 | uid, | |
1579 | 0, /* non standard timer */ | |
1580 | 0, /* open_requests have no inode */ | |
1581 | 0, req); | |
1582 | } | |
1583 | ||
1584 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1585 | { | |
1586 | struct in6_addr *dest, *src; | |
1587 | __u16 destp, srcp; | |
1588 | int timer_active; | |
1589 | unsigned long timer_expires; | |
1590 | struct inet_sock *inet = inet_sk(sp); | |
1591 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1592 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
1593 | struct ipv6_pinfo *np = inet6_sk(sp); |
1594 | ||
1595 | dest = &np->daddr; | |
1596 | src = &np->rcv_saddr; | |
1597 | destp = ntohs(inet->dport); | |
1598 | srcp = ntohs(inet->sport); | |
463c84b9 ACM |
1599 | |
1600 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1601 | timer_active = 1; |
463c84b9 ACM |
1602 | timer_expires = icsk->icsk_timeout; |
1603 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1604 | timer_active = 4; |
463c84b9 | 1605 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1606 | } else if (timer_pending(&sp->sk_timer)) { |
1607 | timer_active = 2; | |
1608 | timer_expires = sp->sk_timer.expires; | |
1609 | } else { | |
1610 | timer_active = 0; | |
1611 | timer_expires = jiffies; | |
1612 | } | |
1613 | ||
1614 | seq_printf(seq, | |
1615 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1616 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", | |
1617 | i, | |
1618 | src->s6_addr32[0], src->s6_addr32[1], | |
1619 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1620 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1621 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1622 | sp->sk_state, | |
1623 | tp->write_seq-tp->snd_una, tp->rcv_nxt-tp->copied_seq, | |
1624 | timer_active, | |
1625 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 1626 | icsk->icsk_retransmits, |
1da177e4 | 1627 | sock_i_uid(sp), |
6687e988 | 1628 | icsk->icsk_probes_out, |
1da177e4 LT |
1629 | sock_i_ino(sp), |
1630 | atomic_read(&sp->sk_refcnt), sp, | |
463c84b9 ACM |
1631 | icsk->icsk_rto, |
1632 | icsk->icsk_ack.ato, | |
1633 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, | |
1da177e4 LT |
1634 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
1635 | ); | |
1636 | } | |
1637 | ||
1638 | static void get_timewait6_sock(struct seq_file *seq, | |
8feaf0c0 | 1639 | struct inet_timewait_sock *tw, int i) |
1da177e4 LT |
1640 | { |
1641 | struct in6_addr *dest, *src; | |
1642 | __u16 destp, srcp; | |
0fa1a53e | 1643 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
1644 | int ttd = tw->tw_ttd - jiffies; |
1645 | ||
1646 | if (ttd < 0) | |
1647 | ttd = 0; | |
1648 | ||
0fa1a53e ACM |
1649 | dest = &tw6->tw_v6_daddr; |
1650 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
1651 | destp = ntohs(tw->tw_dport); |
1652 | srcp = ntohs(tw->tw_sport); | |
1653 | ||
1654 | seq_printf(seq, | |
1655 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
1656 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", | |
1657 | i, | |
1658 | src->s6_addr32[0], src->s6_addr32[1], | |
1659 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1660 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1661 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1662 | tw->tw_substate, 0, 0, | |
1663 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
1664 | atomic_read(&tw->tw_refcnt), tw); | |
1665 | } | |
1666 | ||
1667 | #ifdef CONFIG_PROC_FS | |
1668 | static int tcp6_seq_show(struct seq_file *seq, void *v) | |
1669 | { | |
1670 | struct tcp_iter_state *st; | |
1671 | ||
1672 | if (v == SEQ_START_TOKEN) { | |
1673 | seq_puts(seq, | |
1674 | " sl " | |
1675 | "local_address " | |
1676 | "remote_address " | |
1677 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1678 | " uid timeout inode\n"); | |
1679 | goto out; | |
1680 | } | |
1681 | st = seq->private; | |
1682 | ||
1683 | switch (st->state) { | |
1684 | case TCP_SEQ_STATE_LISTENING: | |
1685 | case TCP_SEQ_STATE_ESTABLISHED: | |
1686 | get_tcp6_sock(seq, v, st->num); | |
1687 | break; | |
1688 | case TCP_SEQ_STATE_OPENREQ: | |
1689 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1690 | break; | |
1691 | case TCP_SEQ_STATE_TIME_WAIT: | |
1692 | get_timewait6_sock(seq, v, st->num); | |
1693 | break; | |
1694 | } | |
1695 | out: | |
1696 | return 0; | |
1697 | } | |
1698 | ||
1699 | static struct file_operations tcp6_seq_fops; | |
1700 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { | |
1701 | .owner = THIS_MODULE, | |
1702 | .name = "tcp6", | |
1703 | .family = AF_INET6, | |
1704 | .seq_show = tcp6_seq_show, | |
1705 | .seq_fops = &tcp6_seq_fops, | |
1706 | }; | |
1707 | ||
1708 | int __init tcp6_proc_init(void) | |
1709 | { | |
1710 | return tcp_proc_register(&tcp6_seq_afinfo); | |
1711 | } | |
1712 | ||
1713 | void tcp6_proc_exit(void) | |
1714 | { | |
1715 | tcp_proc_unregister(&tcp6_seq_afinfo); | |
1716 | } | |
1717 | #endif | |
1718 | ||
1719 | struct proto tcpv6_prot = { | |
1720 | .name = "TCPv6", | |
1721 | .owner = THIS_MODULE, | |
1722 | .close = tcp_close, | |
1723 | .connect = tcp_v6_connect, | |
1724 | .disconnect = tcp_disconnect, | |
463c84b9 | 1725 | .accept = inet_csk_accept, |
1da177e4 LT |
1726 | .ioctl = tcp_ioctl, |
1727 | .init = tcp_v6_init_sock, | |
1728 | .destroy = tcp_v6_destroy_sock, | |
1729 | .shutdown = tcp_shutdown, | |
1730 | .setsockopt = tcp_setsockopt, | |
1731 | .getsockopt = tcp_getsockopt, | |
1732 | .sendmsg = tcp_sendmsg, | |
1733 | .recvmsg = tcp_recvmsg, | |
1734 | .backlog_rcv = tcp_v6_do_rcv, | |
1735 | .hash = tcp_v6_hash, | |
1736 | .unhash = tcp_unhash, | |
1737 | .get_port = tcp_v6_get_port, | |
1738 | .enter_memory_pressure = tcp_enter_memory_pressure, | |
1739 | .sockets_allocated = &tcp_sockets_allocated, | |
1740 | .memory_allocated = &tcp_memory_allocated, | |
1741 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1742 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
1743 | .sysctl_mem = sysctl_tcp_mem, |
1744 | .sysctl_wmem = sysctl_tcp_wmem, | |
1745 | .sysctl_rmem = sysctl_tcp_rmem, | |
1746 | .max_header = MAX_TCP_HEADER, | |
1747 | .obj_size = sizeof(struct tcp6_sock), | |
6d6ee43e | 1748 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1749 | .rsk_prot = &tcp6_request_sock_ops, |
1da177e4 LT |
1750 | }; |
1751 | ||
1752 | static struct inet6_protocol tcpv6_protocol = { | |
1753 | .handler = tcp_v6_rcv, | |
1754 | .err_handler = tcp_v6_err, | |
1755 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1756 | }; | |
1757 | ||
1da177e4 LT |
1758 | static struct inet_protosw tcpv6_protosw = { |
1759 | .type = SOCK_STREAM, | |
1760 | .protocol = IPPROTO_TCP, | |
1761 | .prot = &tcpv6_prot, | |
1762 | .ops = &inet6_stream_ops, | |
1763 | .capability = -1, | |
1764 | .no_check = 0, | |
1765 | .flags = INET_PROTOSW_PERMANENT, | |
1766 | }; | |
1767 | ||
1768 | void __init tcpv6_init(void) | |
1769 | { | |
1770 | /* register inet6 protocol */ | |
1771 | if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0) | |
1772 | printk(KERN_ERR "tcpv6_init: Could not register protocol\n"); | |
1773 | inet6_register_protosw(&tcpv6_protosw); | |
1774 | } |